[AArch64 costs 1/18] Refactor aarch64_address_costs.

git cherry-pick 3d70178

gcc/

	* config/aarch64/aarch64-protos.h (scale_addr_mode_cost): New.
	(cpu_addrcost_table): Use it.
	* config/aarch64/aarch64.c (generic_addrcost_table): Initialize it.
	(aarch64_address_cost): Rewrite using aarch64_classify_address,
	move it.

Change-Id: I4fea98344ad105c98240d23aa2b52d372f0e7fd5
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@210493 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0c34808..04d01a7 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2014-05-16  James Greenhalgh  <james.greenhalgh@arm.com>
+
+       * config/aarch64/aarch64-protos.h (scale_addr_mode_cost): New.
+       (cpu_addrcost_table): Use it.
+       * config/aarch64/aarch64.c (generic_addrcost_table): Initialize it.
+       (aarch64_address_cost): Rewrite using aarch64_classify_address,
+       move it.
+
 2014-04-22  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
 
        * config/aarch64/aarch64.c (TARGET_FLAGS_REGNUM): Define.

diff --git a/gcc/config/aarch64/aarch64-protos.h b/gcc/config/aarch64/aarch64-protos.h
index bef58bf..04b1134 100644 (file)
--- a/gcc/config/aarch64/aarch64-protos.h
+++ b/gcc/config/aarch64/aarch64-protos.h
@@ -108,9 +108,22 @@ enum aarch64_symbol_type
    cost models and vectors for address cost calculations, register
    move costs and memory move costs.  */
 
+/* Scaled addressing modes can vary cost depending on the mode of the
+   value to be loaded/stored.  QImode values cannot use scaled
+   addressing modes.  */
+
+struct scale_addr_mode_cost
+{
+  const int hi;
+  const int si;
+  const int di;
+  const int ti;
+};
+
 /* Additional cost for addresses.  */
 struct cpu_addrcost_table
 {
+  const struct scale_addr_mode_cost addr_scale_costs;
   const int pre_modify;
   const int post_modify;
   const int register_offset;

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 5da3458..b0a3cbb 100644 (file)
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -171,6 +171,15 @@ __extension__
 #endif
 static const struct cpu_addrcost_table generic_addrcost_table =
 {
+#if HAVE_DESIGNATED_INITIALIZERS
+  .addr_scale_costs =
+#endif
+    {
+      NAMED_PARAM (qi, 0),
+      NAMED_PARAM (hi, 0),
+      NAMED_PARAM (si, 0),
+      NAMED_PARAM (ti, 0),
+    },
   NAMED_PARAM (pre_modify, 0),
   NAMED_PARAM (post_modify, 0),
   NAMED_PARAM (register_offset, 0),
@@ -4500,6 +4509,101 @@ aarch64_strip_shift_or_extend (rtx x)
   return aarch64_strip_shift (x);
 }
 
+static int
+aarch64_address_cost (rtx x,
+                     enum machine_mode mode,
+                     addr_space_t as ATTRIBUTE_UNUSED,
+                     bool speed)
+{
+  enum rtx_code c = GET_CODE (x);
+  const struct cpu_addrcost_table *addr_cost = aarch64_tune_params->addr_cost;
+  struct aarch64_address_info info;
+  int cost = 0;
+  info.shift = 0;
+
+  if (!aarch64_classify_address (&info, x, mode, c, false))
+    {
+      if (GET_CODE (x) == CONST || GET_CODE (x) == SYMBOL_REF)
+       {
+         /* This is a CONST or SYMBOL ref which will be split
+            in a different way depending on the code model in use.
+            Cost it through the generic infrastructure.  */
+         int cost_symbol_ref = rtx_cost (x, MEM, 1, speed);
+         /* Divide through by the cost of one instruction to
+            bring it to the same units as the address costs.  */
+         cost_symbol_ref /= COSTS_N_INSNS (1);
+         /* The cost is then the cost of preparing the address,
+            followed by an immediate (possibly 0) offset.  */
+         return cost_symbol_ref + addr_cost->imm_offset;
+       }
+      else
+       {
+         /* This is most likely a jump table from a case
+            statement.  */
+         return addr_cost->register_offset;
+       }
+    }
+
+  switch (info.type)
+    {
+      case ADDRESS_LO_SUM:
+      case ADDRESS_SYMBOLIC:
+      case ADDRESS_REG_IMM:
+       cost += addr_cost->imm_offset;
+       break;
+
+      case ADDRESS_REG_WB:
+       if (c == PRE_INC || c == PRE_DEC || c == PRE_MODIFY)
+         cost += addr_cost->pre_modify;
+       else if (c == POST_INC || c == POST_DEC || c == POST_MODIFY)
+         cost += addr_cost->post_modify;
+       else
+         gcc_unreachable ();
+
+       break;
+
+      case ADDRESS_REG_REG:
+       cost += addr_cost->register_offset;
+       break;
+
+      case ADDRESS_REG_UXTW:
+      case ADDRESS_REG_SXTW:
+       cost += addr_cost->register_extend;
+       break;
+
+      default:
+       gcc_unreachable ();
+    }
+
+
+  if (info.shift > 0)
+    {
+      /* For the sake of calculating the cost of the shifted register
+        component, we can treat same sized modes in the same way.  */
+      switch (GET_MODE_BITSIZE (mode))
+       {
+         case 16:
+           cost += addr_cost->addr_scale_costs.hi;
+           break;
+
+         case 32:
+           cost += addr_cost->addr_scale_costs.si;
+           break;
+
+         case 64:
+           cost += addr_cost->addr_scale_costs.di;
+           break;
+
+         /* We can't tell, or this is a 128-bit vector.  */
+         default:
+           cost += addr_cost->addr_scale_costs.ti;
+           break;
+       }
+    }
+
+  return cost;
+}
+
 /* Calculate the cost of calculating X, storing it in *COST.  Result
    is true if the total cost of the operation has now been calculated.  */
 static bool
@@ -4819,37 +4923,6 @@ aarch64_rtx_costs (rtx x, int code, int outer ATTRIBUTE_UNUSED,
 }
 
 static int
-aarch64_address_cost (rtx x ATTRIBUTE_UNUSED,
-                 enum machine_mode mode ATTRIBUTE_UNUSED,
-                 addr_space_t as ATTRIBUTE_UNUSED, bool speed ATTRIBUTE_UNUSED)
-{
-  enum rtx_code c  = GET_CODE (x);
-  const struct cpu_addrcost_table *addr_cost = aarch64_tune_params->addr_cost;
-
-  if (c == PRE_INC || c == PRE_DEC || c == PRE_MODIFY)
-    return addr_cost->pre_modify;
-
-  if (c == POST_INC || c == POST_DEC || c == POST_MODIFY)
-    return addr_cost->post_modify;
-
-  if (c == PLUS)
-    {
-      if (GET_CODE (XEXP (x, 1)) == CONST_INT)
-       return addr_cost->imm_offset;
-      else if (GET_CODE (XEXP (x, 0)) == MULT
-              || GET_CODE (XEXP (x, 0)) == ZERO_EXTEND
-              || GET_CODE (XEXP (x, 0)) == SIGN_EXTEND)
-       return addr_cost->register_extend;
-
-      return addr_cost->register_offset;
-    }
-  else if (c == MEM || c == LABEL_REF || c == SYMBOL_REF)
-    return addr_cost->imm_offset;
-
-  return 0;
-}
-
-static int
 aarch64_register_move_cost (enum machine_mode mode,
                            reg_class_t from_i, reg_class_t to_i)
 {